On Mon, May 26, 2008 at 4:11 PM, Raymond Hettinger <python at rcn.com> wrote: >>> Deque's do not support count(), insert() or __iadd__(). >>> They should not be registered. > >> If it doesn't implement the MutableSequence protocol it still is a Sized >> container. However currently it's not registered as a container. > > Seems useless to me. I don't think the intent of the ABC pep was > to mandate that every class that defines __len__ must be registered > as Sized. There's no need to register as Sized -- the Sized ABC recognizes classes that define __len__ automatically. The Container class does the same looking for __contains__. Since the deque class doesn't implement __contains__, it is not considered a Container -- correctly IMO. >> Another issue is that builtin types don't accept ABCs currently. For >> example >> set() | SomeSet() gives a TypeError, SomeSet() | set() however works. > > Pandora's Box -- sure you want to open it? In 3.0 I'd like to; this was my original intent. In 2.6 I think it's not worth the complexity, though I won't complain. -- --Guido van Rossum (home page: http://www.python.org/~guido/)
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4